当发生火灾事故的时候，如何最迅速并安全地脱离火灾现场？根据火场实践和科学试验，允许疏散时间一般依据火灾时烟对人体的危害、建筑物的耐火能力和出火（爆燃）的时间来决定。一般情况下，火场上出现浓烟、高热缺氧等致人伤亡的时间，早的5～6分钟，迟的在10～20分钟。房屋 How to get out of the fire quickly and safely when a fire breaks out? According to fire practice and scientific experiments, the allowable evacuation time is generally determined by the hazard of smoke on the human body in the event of a fire, the fire resistance of the building and the time of fire (deflagration). Under normal circumstances, there are smoke on the scene, high fever and hypoxia caused by casualties time, as early as 5 to 6 minutes late in 10 to 20 minutes. houses